Pressure-induced superconductivity in single crystal CaFe2As2

TL;DR

This study demonstrates that applying pressure to CaFe2As2 induces superconductivity, transforming it from an antiferromagnetic state at ambient conditions to a superconducting state above 0.69 GPa with a transition temperature over 10 K.

Contribution

It reveals pressure as a tuning parameter to induce superconductivity in CaFe2As2, providing insights into the interplay between magnetism and superconductivity in iron-based materials.

Findings

Superconductivity appears above 0.69 GPa

Transition temperature exceeds 10 K

Upper critical field estimated at 10-14T

Abstract

We report pressure-induced superconductivity in a single crystal of CaFe2As2. At atmospheric pressure, this material is antiferromagnetic below 170 K but under an applied pressure of 0.69 GPa becomes superconducting, with a transition temperature Tc exceeding 10 K. The rate of Tc suppression with applied magnetic field is -0.7 K/T, giving an extrapolated zero-temperature upper critical field of 10-14T.